Flexible duct



FIG. 1 is a Side view in compressed position of a flexible duct;

FIG. 2 is a Left end view of a flexible duct;

FIG. 3 is a Right end view of a flexible duct;

FIG. 4 is a Top and bottom view when partially open of a flexible duct;

FIG. 5 is a Front and rear view when partially open of a flexible duct; and,

FIG. 6 is a Perspective view when partially open of a flexible duct. 

The ornamental design for a flexible duct, as shown and described. 